the gutterball is a nice bike. it's great for 450(what they're going for now) and still a good bike at 550.
the GTB isn't made anymore which is why everyone's making you feel like a big idiot, and it's a phenomenal bike.
the kilo is a great bike too but it's not 'better' than a gutterball in my opinion. it's about the same, just steel so a little different.